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Kütahya, G. Determination of the Relationship Between Nutritional Status and Dichotomous Thinking in eating Disorders Scale (DTEDS) in Adult Women. Hacettepe University, Graduate School of Health Sciences, Community Nutrition Program. Master Thesis, Ankara, 2019. Eating disorders are physiological disorders caused by eating behaviors, related thoughts, attitudes and emotions. Dichotomic thinking has been associated with excessive eating and increased body weight. The aim of this study was to evaluate the relationship between the Dichotomous Thinking in Eating Disorders (DTEDS) and nutritional status in obese or overweight adult women. This observational study was conducted between January 2018 and July 2019 in Ankara. The study included 110 women classified as overweight or obese according to the body mass index (BMI). A questionaire examining descriptive and anthropometric information along with Eating Disorders Associated Eating Attitude Test (EAT-26), Yale Food Addiction Scale and DTEDS were applied to participants. In addition, the Turkish validity and reliability study of the DTEDS scale was performed by re-testing method with 30 individuals. SPSS 23.0 program was used for statistical analysis. P value less than 0.05 was considered statistically significant. According to the Turkish version of the DTEDS, validity (coefficient = 0.075; t = 0.940, p = 0.355) and reliability (cronbach's alpha = 0.808) were appropriate. The mean age of the individuals was 36.81 ± 12.03 years and the mean BMI was 30,34±4,8 kg/m2. According to BMI classification, 61 individuals were overweight (25.5-29.9 kg/m2) and 49 individuals were obese (≥30.0 kg/m2). There was a negative correlation between BMI and eating addiction score (YALE) (p0,05). It was observed that 48 (55.8%) of the overweight individuals and 38 (44.2%) of the obese individuals who were considered risky for DTEDS, had the risk of dicotomic thought disorder and related eating disorder. No statistically significant correlation was found between DTEDS score and YALE, EAT scores (p> 0.05). In terms of foods, ice cream, chocolate, fried dough and dessert, donut, rice, crackers, salted pretzels, cookies, cake-bakery, confectionery, rice, pizza, soda, steak, bacon, banana has been observed that problems with foods such as may be associated with eating disorder (p<0,05). There is a significant relationship between exercise type and DTEDS, EAT and YALE and significant relationship between regular exercise and EAT. In conclusion, the valid and reliable version of Turkish DTEDS scale can be assessed in studies examining eating disorders and obesity related eating attitudes.